<template>
  <div>
    <!--面包屑导航区域-->
    <el-breadcrumb separator='/'>
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品列表</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!--卡片视图-->
    <el-card>
      <el-alert
        title='添加商品信息'
        type='info'
        center
        show-icon
        :closable=false>
      </el-alert>
      <!--步骤条区域-->
      <el-steps :active='activeIndex - 0' finish-status='success' align-center>
        <el-step title='基本信息'></el-step>
        <el-step title='商品参数'></el-step>
        <el-step title='商品属性'></el-step>
        <el-step title='商品列表'></el-step>
        <el-step title='商品内容'></el-step>
        <el-step title='完成'></el-step>
      </el-steps>
      <!--表单区域-->
      <el-form :model='addForm' :rules='addFormRules' ref='addFormRef' label-width='100px' label-position='top'>
        <!--tag区域-->
        <el-tabs v-model='activeIndex' :tab-position="'left'" :before-leave='beforeTabLeave' @tab-click='tabClicked'>
          <el-tab-pane label='基本信息' name='0'>
            <el-form-item label='商品名称' prop='goods_name'>
              <el-input v-model='addForm.goods_name'></el-input>
            </el-form-item>
            <el-form-item label='商品价格' prop='goods_price'>
              <el-input v-model='addForm.goods_price'></el-input>
            </el-form-item>
            <el-form-item label='商品重量' prop='goods_weight'>
              <el-input v-model='addForm.goods_weight'></el-input>
            </el-form-item>
            <el-form-item label='商品数量' prop='goods_number'>
              <el-input v-model='addForm.goods_number'></el-input>
            </el-form-item>
            <el-form-item label='商品分类' prop='goods_cat'>
              <el-cascader
                v-model='addForm.goods_cat'
                :options='catelist'
                :props='cateProps'
                @change='handleChange'></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label='商品参数' name='1'>
            <!--渲染表单的Item项-->
            <el-form-item :label='item.attr_name' v-for='item in manyTableData' :key='item.attr_id'>
              <el-checkbox-group v-model='item.attr_vals'>
                <el-checkbox border :label='cb' v-for='(cb, i) in item.attr_vals' :key='i'></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label='商品属性' name='2'>
            <el-form-item :label='item.attr_name' v-for='item in onlyTableData' :key='item.attr_id'>
              <el-input v-model='item.attr_vals'></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label='商品图片' name='3'>
            <!--action 表示图片要上传到的后台API地址-->
            <el-upload
              :action='uploadURL'
              :on-preview='handlePreview'
              :on-remove='handleRemove'
              list-type='picture'
              :headers='headerObj'
              :on-success='handleSuccess'>
              <el-button size='small' type='primary'>点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label='商品内容' name='4'>
            <!--富文本编辑器组件-->
            <quill-editor v-model='addForm.goods_introduce'></quill-editor>
            <!--添加商品的按钮-->
            <el-button type='primary' class='btnAdd' @click='add'>添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!--图片预览-->
    <el-dialog
      title='图片预览'
      :visible.sync='previewVisible'
      width='50%'>
      <img :src='previewPath' alt='' class='previewImg'>
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'

export default {
  data () {
    return {
      activeIndex: '0',
      // 添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        // 图片的数组
        pics: [],
        // 商品的详情描述
        goods_introduce: '',
        attrs: []
      },
      addFormRules: {
        goods_name: [
          {
            required: true,
            message: '请输入商品信息',
            trigger: 'blur'
          }
        ],
        goods_price: [
          {
            required: true,
            message: '请输入商品价格',
            trigger: 'blur'
          }
        ],
        goods_weight: [
          {
            required: true,
            message: '请输入商品重量',
            trigger: 'blur'
          }
        ],
        goods_number: [
          {
            required: true,
            message: '请输入商品数量',
            trigger: 'blur'
          }
        ],
        goods_cat: [
          {
            required: true,
            message: '请选择商品分类',
            trigger: 'blur'
          }
        ]
      },
      catelist: [],
      cateProps: {
        expandTrigger: 'hover',
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 动态参数列表数据
      manyTableData: [],
      // 静态属性列表数据
      onlyTableData: [],
      // 上传图片的URL地址
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 图片上传组件的headers请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      previewPath: '',
      previewVisible: false
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取所以商品分类信息
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类数据失败')
      }
      this.catelist = res.data
    },
    // 级联选择器选中项变化，会触发这个函数
    handleChange () {
      console.log(this.addForm.goods_cat)
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    beforeTabLeave (activeName, oldActiveName) {
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类')
        return false
      }
    },
    async tabClicked () {
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: {
            sel: 'many'
          }
        })
        if (res.meta.status !== 200) {
          return this.$message.error('获取动态参数失败')
        }
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        console.log(res.data)
        this.manyTableData = res.data
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: {
            sel: 'only'
          }
        })
        if (res.meta.status !== 200) {
          return this.$message.error('获取静态属性失败')
        }
        this.onlyTableData = res.data
      }
    },
    // 处理图片预览效果
    handlePreview (file) {
      console.log(file.response.data.url)
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 处理移除图片的操作
    handleRemove (file) {
      // console.log(file)
      // 1.获得将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2.从pics数组中，找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(x => x.pics === filePath)
      // 3.调用数组的 splice 方法，把图片信息对象，从pics数组中移除
      this.addForm.pics.splice(i, 1)
      console.log(this.addForm)
    },
    // 监听图片上传成功的事件
    handleSuccess (response) {
      console.log(response)
      // 1. 拼接得到一个图片信息对象
      const picInfo = { pic: response.data.temp_path }
      // 2. 将图片信息对象，push到pics数组中
      this.addForm.pics.push(picInfo)
      console.log(this.addForm)
    },
    // 添加商品
    add () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项')
        }
        // 执行添加的业务逻辑
        // 深拷贝，把数组转化为字符而不影响v-model所需要的数组
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        console.log(form)
        // 发起请求添加商品
        // 商品的名称，必须是唯一的
        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status !== 201) {
          return this.$message.error('添加商品失败')
        }
        this.$message.success('添加商品成功')
        this.$router.push('/goods')
      })
    }
  },
  computed: {
    cateId () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang='less' scoped>
.el-checkbox {
  margin: 0 10px 0 0 !important;
}

.previewImg {
  width: 100%;
}

.btnAdd {
  margin-top: 15px;
}

</style>
